中国电机工程学报2017，Vol.37Issue(6)：1764-1776,13.DOI:10.13334/j.0258-8013.pcsee.160340
一种新的Y型大功率模块化多电平交交变流器及其控制策略
A Novel High-power AC/AC Modular Multilevel Converter in Y Configuration and Its Control Strategy
摘要
Abstract
As the key equipment for power conversion,a new high-power direct AC/AC modular multilevel converter topology in Y configuration,which is called Y-MMC,suitable for low frequency power transmission and distribution applications was proposed.Y-MMC can realize direct AC/AC power conversion with only 6 equivalent branches and has a satisfying performance in both output voltage quality and power characteristics.Y-MMC enjoys a simple and symmetric structure and has no circulating current problem.The dynamic mathematical model of the Y-MMC system in dq coordinates was deduced,where AC components with two different frequencies are decoupled completely.Corresponding control strategy was thoroughly discussed,including the inner loop current control and the outer loop power control.This paper also lays the emphasis on the optimization of reactive power distribution between main branches and assistant branches by introducing the reactive power distribution coefficients k1 and k2 into the system control scheme.The analytical expressions between k1,k2 and the modulation degree of the Y-MMC branches were detailed deduced and the optimal solution was also provided.The validity of the Y-MMC topology and the control strategy as well as the theoretical analysis proposed in this paper was verified by computer simulation results.关键词
Y-MMC/低频输配电系统/数学模型/控制策略/无功优化Key words
Y-MMC/low frequency power transmission and distribution system/mathematical model/control strategy/reactive power optimization分类
信息技术与安全科学引用本文复制引用
刘勃,孟永庆,白森戈,张海涛..一种新的Y型大功率模块化多电平交交变流器及其控制策略[J].中国电机工程学报,2017,37(6):1764-1776,13.基金项目
国家电网公司科技项目(52094016000C).SGCC Science and Technology Project (52094016000C). （52094016000C）
